What Are Lithium Button Batteries?

Lithium button batteries and coin cell batteries provide compact, reliable power for a wide range of electronic devices, from medical equipment to consumer electronics. Understanding their characteristics, sizing standards, and application requirements is essential for proper selection and use.

Key Takeaways

• Lithium button batteries (coin cell batteries) are non-rechargeable, 3V primary cells optimized for compact, low-drain electronics.
• Coin cell batteries are a standardized subset of flat round batteries, offering higher voltage stability and longer shelf life.
• CR-series lithium coin cells (CR2032, CR2025, CR2016) dominate applications requiring long standby time and consistent voltage.
• Battery selection should prioritize size code, voltage compatibility, discharge profile, and leakage resistance.
• Most lithium button batteries are not rechargeable; using the wrong type can cause device failure or safety risks.

Part 1. What are lithium button batteries?

Definition & Core characteristics

Lithium button batteries, also commonly called coin cell batteries, are flat, round, non-rechargeable primary batteries that use lithium-based chemistry to deliver long-lasting and highly stable power.

Unlike cylindrical AA or AAA batteries, lithium button batteries are designed for:

• Ultra-compact electronic devices
• Low to moderate continuous current draw
• Long shelf life and standby reliability

Key Technical Specifications:

• Nominal voltage: 3.0V
• Typical chemistry: Lithium manganese dioxide (Li-MnO₂)
• Operating temperature range: -30°C to +60°C
• Self-discharge rate: <1% per year

Lithium vs other button battery chemistries

Why Lithium Coin Cells Are Preferred:

• Stable voltage output until end-of-life
• Excellent cold-temperature performance
• Minimal leakage risk for sensitive electronics

What Is Battery Self-Discharge Rate?

Part 2. Flat round batteries vs. coin cell batteries

What are flat round batteries?

Flat round batteries are a broad category of disc-shaped batteries that includes lithium, alkaline, silver oxide, and zinc-based chemistries. Sizes typically range from 5mm to over 40mm in diameter.

They are commonly used in:

• Watches
• Hearing aids
• Remote controls
• Calculators
• Simple toys

What are coin cell batteries?

Coin cell batteries are a standardized subset of flat round batteries, most commonly lithium-based, designed with defined IEC size codes (e.g. CR2032).

Key differences at a glance

Part 3. Major lithium coin cell battery types

CR2032 – Industry standard

• Size: 20mm × 3.2mm
• Capacity: ~220mAh
• Applications: PC motherboards, car key fobs, medical devices

CR2025 – Slim profile

• Size: 20mm × 2.5mm
• Capacity: ~170mAh
• Applications: fitness trackers, slim remotes

CR2016 – Ultra-thin

• Size: 20mm × 1.6mm
• Capacity: ~90mAh
• Applications: Bluetooth trackers, compact sensors

Part 4. Button battery size coding explained

• CR = Lithium chemistry
• First two digits = diameter (mm)
• Last two digits = thickness (0.1mm)

Button Battery Size Guide

Part 5. Lithium coin cell battery voltage, rechargeability & safety

Why 3V matters

• Direct compatibility with CMOS and low-power ICs
• Reduced need for voltage regulation
• Higher energy per cell

Are lithium button batteries rechargeable?

No. Standard CR-series lithium button batteries are not rechargeable.

Recharge attempts may cause overheating, rupture, or fire.

Rechargeable exceptions:

• LIR2032 (3.7V Li-ion, lower capacity)
• ML series (industrial backup use)

Part 6. Lithium button battery lifespan, storage & disposal

Typical lifespan

• Storage: 10+ years
• Low-drain devices: 3–7 years
• Moderate-drain devices: 1–3 years

Safe storage

• Original packaging
• Dry, room-temperature environment
• Away from children and pets

Disposal & Environmental impact

• Recycle at certified battery centers
• Tape terminals before disposal
• Never discard in household trash

Part 7. Lithium coin cell battery common applications

• Watches & key fobs
• Medical devices (glucose meters, thermometers)
• PC motherboards (BIOS memory)
• IoT sensors & wireless modules

Talk to an Engineer

Part 8. FAQ: Lithium button & coin cell batteries